This car was sold at B-J about 5-6 years ago for around $45,000. I have not seen or heard of it since but I was told it was a real LS-6, just not a real L-89. However, I never got the chance to investigate further. I too have heard they did in fact make L-89/LS-6's but have never seen proof of this. I am keeping an open mind.
Rick (mr70), couldn't this be as much a possibility as the supposed ZL-1/454 '70 Chevelle?
Rick